(1) A stand-alone mail server that plugs into the network to provide e-mail for an organization. Typically rack-mounted hardware, the device includes software that provides the message store and transfer agent (see mail server and messaging system). Users access their mail with a client program in their computers or via a Web browser. See server appliance.
One of the first e-mail appliances, this seven-ounce Postbox Express fit in your pocket and had a built-in analog modem. It plugged into a standard telephone jack. (Image courtesy of VTech Holdings Ltd., www.vtech.com)
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